Some researchers believe that there is no doubt ______recycling saves energy and

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问题 Some researchers believe that there is no doubt ______recycling saves energy and raw materials, and reduces pollution.

选项 A、which
B、that
C、what
D、whether

答案 B

解析句子结构分析题。名词doubt“怀疑”后的同位语从句用whether连接，如：There is some doubt whether he can recover from the serious disease．在no doubt“不怀疑”之后的同位语从句用that连接。答案为B。

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